appendPath

Added appendPath in NSString.
Add libraryPath for saving private file/documents for an iOS app.
Added hasKey to NSDictionary.
Removed $ sign from function names.

Removed $ prefix from function names to aid in autocomplete.
Remove s.clean_paths from podspec

Remove s.clean_paths from podspec for new cocoapods.
Trim string
NSString equals and notEquals
Fixed notEquals method
Add System Versioning Preprocessor Macros.

Copied from https://gist.github.com/alex-cellcity/998472.
Update README.md
Merge remote-tracking branch 'basitali/master' into my

Conflicts:
	src/NSString+ConciseKit.h
	src/NSString+ConciseKit.m

	modified:   ConciseKit.podspec
	modified:   ConciseKitSpecs/Spec/ConciseKitSpec.m
	modified:   ConciseKitSpecs/Spec/Fixtures/CKMocks.m
	modified:   ConciseKitSpecs/Spec/NSArrayConciseKitSpec.m
	modified:   ConciseKitSpecs/Spec/NSDictionaryConciseKitSpec.m
	modified:   ConciseKitSpecs/Spec/NSStringConciseKitSpec.m
	modified:   README.md
	modified:   src/CKMacros.h
	modified:   src/ConciseKit.h
	modified:   src/ConciseKit.m
	modified:   src/NSArray+ConciseKit.h
	modified:   src/NSArray+ConciseKit.m
	modified:   src/NSDictionary+ConciseKit.h
	modified:   src/NSDictionary+ConciseKit.m
	modified:   src/NSString+ConciseKit.h
	modified:   src/NSString+ConciseKit.m