Update README.md

Added license section to readme
Initial support for ctrl-c interruption
Broke out ctrl-c handling to separate file
Merge pull request #82 from mcg1969/ctrlc

Add support for Ctrl-C
Fixed minor glitch with ctrlc handling under Win/Matlab.

Moved init_cntrlc() downwards - for compatibility with VS compilers. Added -lut to makemex.m
Added exponential cone functionality to all but python bindings untested
code cleanup