fix documentation for --search and use main.search_file to support it, rename 'log' to '_log' in main.py
ignore all hidden dirs in search_file
only unconsider .git and .svn, we still want .local
Merge branch 'develop' into search_help

Conflicts:
	easybuild/main.py
Merge pull request #622 from boegel/search_help

fix --search help and implementation