Add get_mode command to get file mode
Add be_readable, be_writable and be_executable file matchers
Add spec for get_mode command
Add spec for be_readable, be_writable and be_executable matchers
Fix calculation of mode_octal
Merge pull request #48 from mizzy/rwx_file_matchers

be_readable, be_writable and be_executable file matchers
Bump up version
Send example to backend
Simplify Exec backend with a method_missing method
Merge pull request #49 from raphink/dev/propagate_example

Send example to backend
Merge pull request #50 from raphink/dev/simplify_exec_backend

Simplify Exec backend with a method_missing method