Update README.md

Quick edit.
Change validation of max name lenght in PBS class

Fixes #45
Start updating documentation.
Fixed newline.
Fixed newline.
Fixed newline.
Added MammouthJobGenerator do handdle the special ppn

Fixes #46
Merge branch 'master' into update_doc

Conflicts:
	README.md
Removed debug print.
Added unit test for MammouthJobGenerator
Moved the import of re at the top.
Removed unused import.
Added job_generator_factory test and fixed a bug in job_generator_factory.
Merge pull request #48 from mgermain/mammouth_gen

Added MammouthJobGenerator do handdle the special ppn
Merge pull request #47 from MarcCote/update_doc

Update doc
Update README.md

Mini cleanup
Update README.md

typo
Change directory before executing a command.
Added double quotes surrounding the path.
Merge pull request #51 from MarcCote/fix_cwd

FIX: Change directory before executing a command.