Quite a few changes here.
Added in generic 'blink' programs in the examples in C, RTB and Shell.
Updated wiringPi with a little big-file on the millis() function and
added in a new micros() function too.
Updated the examples with standard LGPL headers.
Added a new isr-osc.c test program - just for ISR timing purposes.
Fixed a minor formatting issue in gpio readall
Added a clock mode to enable the GPIo pins to be set with
one of the GPCLK drivers to generate a frequency up to
19.2MHz.

Tidied some code up and added the clock functions into the gpio
utility.
Merge branch 'master' of git://git.drogon.net/wiringPi
Tidy up python bindings