Added get_cpu_speed to tools.systemtools

Returns the maximum cpu speed in MHz.
get_cpu_speed: make code python 2.4 compatible
Cleanup: use constant UNKNOWN instead of string
Merge pull request #679 from boegel/module_naming_scheme

add support for alternative module naming schemes
Merge pull request #696 from boegel/module_naming_scheme

run 'lmod use' on all module paths that should be considered
Merge branch 'develop' into test
fix remarks in systemtools.py + enhancements and style fixes, add unit tests for systemtools.py
fix os.path.exists lines in systemtools.py
revert back to try-except when reading system files in systemtools.py
Merge pull request #694 from wpoely86/cpuspeed

Added get_cpu_speed to tools.systemtools
Fixed small error: use group(1) from regex
Merge pull request #699 from wpoely86/cpuspeed

Cpuspeed: fixed error
restore original environment after running 'module purge'
get rid of camel casing (origEnviron -> orig_environ)
Merge branch 'restore_env_after_purge' into module_naming_scheme