Update DropboxBrowser.podspec

Update DropboxBrowser.podspec

Update DropboxBrowser.podspec

Update and rename License.md to LICENSE

Merge pull request #24 from bryant1410/master

Fix broken headings in Markdown files

Code Refactor; Localization; New Methods; Assets

Refactored code to modern Objective-C. Modernization changes include
instancetype, auto-synthesized properties, NS_ENUM usage, and more.
Localized DropboxBrowser strings by converting them to
NSLocalizedStrings. Made the updateContent and logoutOfDropbox methods
public. Moved file icons from folder to XCAssets Catalog.

Version 5.0

Breaking Changes, iOS 7 Redesign, new features, new delegates, enhancements, bug fixes, and better documentation.

Merge pull request #8 from andrew-j-porter/master

Overall improvements, adds allowedFileTypes functionality.

Removed Duplicate Files, Bug Fixes, Minor Ui Updates

Version 4.0

Large update - One Class, Simpler Code, New Graphics, Animations,
Auto-Authentication, Bug Fixes, Performance Improvements