Merge pull request #37 from alexschiller/dev

Hotfix: Static file issue in player
Merge pull request #38 from alexschiller/dev

hotfix: for static folder structure
Rename installer.py -> cli.py and rename command
Add mfr.PACKAGE_DIR constant
Add <module> argument
Move core mfr tests outside of package
Remove implicit addition of leading slash
Merge pull request #41 from CenterForOpenScience/no-implicit-slash

Remove implicit addition of leading slash