Starting cleanup bidirpath.cc for improve readability
Merge branch 'master' into bidirectional_cleanup
Indent comments for improve readability
Finally, applied AStyle code format from Code:Blocks IDE
Merge pull request #70 from YafaRay/bidirectional_cleanup

Bidirectional cleanup
Merge branch 'master' into merge_SSS
Indent code for improve readability.
Change 'exp' to 'expn' for fix conflict with math variable 'exp' (exponential)
Small code indent..