Added support for Linux system environments

* Using platform-specific path delimiters instead of fixed backslash
* Also searching SVN executable in the PATH environment variable
* Updated help message
Added support for Linux system environments

* Using platform-specific path delimiters instead of fixed backslash
* Also searching Git executable in the PATH environment variable
* Updated help message
Added missing output of commit date and time, using 'svn log' (only for SVN 1.7+)
Merged some rediscovered commits
Version 1.7