cleanup: Remove definitions and move them to its relative places accordingly

- Move fs-definitions.go and break them into fs-datatypes.go, fs-bucket-acl.go
  and fs-utils.go
- Move api-definitions.go to api-response.go, where they should be.
- Move web-definitions to its related handlers.

pkg/fs/fs-datatypes.go

@@ -0,0 +1,113 @@
+/*
+ * Minio Cloud Storage, (C) 2015, 2016 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package fs
+
+import (
+	"os"
+	"time"
+)
+
+// BucketMetadata - name and create date
+type BucketMetadata struct {
+	Name    string
+	Created time.Time
+	ACL     BucketACL
+}
+
+// ObjectMetadata - object key and its relevant metadata
+type ObjectMetadata struct {
+	Bucket string
+	Object string
+
+	ContentType string
+	Created     time.Time
+	Mode        os.FileMode
+	MD5         string
+	Size        int64
+}
+
+// PartMetadata - various types of individual part resources
+type PartMetadata struct {
+	PartNumber   int
+	LastModified time.Time
+	ETag         string
+	Size         int64
+}
+
+// ObjectResourcesMetadata - various types of object resources
+type ObjectResourcesMetadata struct {
+	Bucket               string
+	Object               string
+	UploadID             string
+	StorageClass         string
+	PartNumberMarker     int
+	NextPartNumberMarker int
+	MaxParts             int
+	IsTruncated          bool
+
+	Part         []PartMetadata
+	EncodingType string
+}
+
+// UploadMetadata container capturing metadata on in progress multipart upload in a given bucket
+type UploadMetadata struct {
+	Object       string
+	UploadID     string
+	StorageClass string
+	Initiated    time.Time
+}
+
+// BucketMultipartResourcesMetadata - various types of bucket resources for inprogress multipart uploads
+type BucketMultipartResourcesMetadata struct {
+	KeyMarker          string
+	UploadIDMarker     string
+	NextKeyMarker      string
+	NextUploadIDMarker string
+	EncodingType       string
+	MaxUploads         int
+	IsTruncated        bool
+	Upload             []*UploadMetadata
+	Prefix             string
+	Delimiter          string
+	CommonPrefixes     []string
+}
+
+// ListObjectsResult - container for list object request results.
+type ListObjectsResult struct {
+	IsTruncated bool
+	NextMarker  string
+	Objects     []ObjectMetadata
+	Prefixes    []string
+}
+
+// CompletePart - completed part container
+type CompletePart struct {
+	PartNumber int
+	ETag       string
+}
+
+// completedParts is a sortable interface for Part slice
+type completedParts []CompletePart
+
+func (a completedParts) Len() int           { return len(a) }
+func (a completedParts) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
+func (a completedParts) Less(i, j int) bool { return a[i].PartNumber < a[j].PartNumber }
+
+// CompleteMultipartUpload container for completing multipart upload
+type CompleteMultipartUpload struct {
+	Part []CompletePart
+}