Removed code duplication in methods `dateFrom...`
Merge pull request #15 from yas375/remove-some-code-dups

Removed some code duplication in methods `dateFrom...`
MAJOR REVISION. Every method now has an mt_ namespace. Added support for all international calendars.
updating readme
Add MTDATES_SHORTHAND macro which removes the need to use prefix on methods when set.
Update readme to clarify using library with/without prefixes.
Rename MTDATES_SHORTHAND to MTDATES_NO_PREFIX
minor formatting fix
Merge pull request #17 from ryanmaxwell/master

Method Prefixing option
bumping podspec version
implementing locking rather than thread confinement
NSMutableDictionary was being used to confine all the non-thread safe objects, but NSMD is non-thread-safe itself...oops. Locking has been implemented. Works very fast and is much safer.
Add Class methods for constructing NSDate object based on start or end of yesterday, today and tomorrow.
Merge pull request #19 from jeddison/issues/18

Add further convenience class methods for constructing NSDate objects