Added possibility of desactivating regex highlighting.
Rewrote the minor-mode using the define-minor-mode macro and added RET
key in loccur-mode to select line.
Added loccur-no-highlight function.
Added detailed info on the README file.
Updated change log in the loccur.el file.
Fixed displaying problems on github caused by the README file.
Added internal link to the "quick navigation" in the README file.
Merge pull request #1 from picarresursix/master

Support for RET in loccur-mode