Corrections to time library and makefile
Latest changes and bugfixes for i2c library
Added "GetPortDirect" function to IO. Allows access to PORT register pointer.
Added suppression of automatic PCINT vector generation
Removed volatile specifier from data pointers
Software serial uses GetPortDirect function
Latest changes and bugfixes for DS3231 library
Moved test for DS3231 library
First commit of external interrupt library
Merge with latest
Merge branch 'master' of github.com:jamesfowkes/Code-Library