Allow directory upload

Transmit directory thanks to tar and bzip2
Correct and purify installation functions

Logic structure improvement.
Alias should be installed if [ba|k|c]shrc does not exist or does not
contain yet alias.
Minor corrections on conditions statements
Correct all forms of quoting

Prefer $() over backtick
Use -s option to make curl silent instead of redirectiong on /dev/null
Centralize downloading of last version of scripts
Fix minor forgetting
Remove install.sh file as wsend handle this on its own
Fix login checking
Merge pull request #2 from vannell/master

Allow directory upload
I'm merging the pull request after testing.  I will add the install.sh script back in because while redundant, it allows a user to easily install.  Also fixing trailing slash from directory