Added Cocoa Encyclopedia
Added NSHipster's "fake" book of concise examples
Added Swift reference
GitPrint.com for PDF version
Fix for escaping compound assignment operators
add defined operator description https://gcc.gnu.org/onlinedocs/cpp/Defined.html#Defined
Prettify formating
Merge pull request #6 from skywinder/defined-explanation

Add defined operator
Merge pull request #1 from iwasrobbed/master

Some Update