Fix regex for comment stripping

New regex will correctly strip such comments:
/*
 * There are space before the star in this line
 */

Regex is found here http://ostermiller.org/findcomment.html in section "An Easier Method".

btsync.conf with such comments is generated by this program https://github.com/emlun/btsync-autoconfig
Merge pull request #30 from PIlin/fix_regex

Fix regex for comment stripping