Edit readme
Completely rewrite Readme, add Authors and Dependencies
Minor typographical fix
[issue 6] Update Dependencies.md: Python must be version 2.7 or up
Update Readme.md: rscall replaced by rsshell
Refer to Dependencies.md from Readme.md
Remove nag about merging unfinished branches from Readme.md
Add general rule of thumb to Readme.md
Remove TOC from Readme, as it doesn't really help
Add Git tutorial to Dependencies.md
Adjust rsshell for better reuse of root detection
Initial setup script with temporary solution for installation

The setup script always:
 -  finds the proper RED_SPIDER_ROOT with optional user intervention;
 -  stores RED_SPIDER_ROOT to a config file in the user's HOME;

and optionally, also:
 -  creates the build, bin and lib directories;
 -  installs scripts and Python modules, stripping off file extensions
    for the commands on POSIX;
 -  informs the user on how to use rsshell.

The installation procedure is currently integrated into the setup
script, but in the future it should be handled by an external build
tool. In particular, this is not going to work when anything other
than Python source code needs to be compiled.
Adapt rsshell to use external config file from setup
Add environment vars to rsshell because of setup
Hard wrap License.txt to 70 characters
Adapt Readme to recently merged changes from setup
Move root detection entirely to setup.py
Rename set_red_spider_root to get_red_spider_root in rsshell.py
Let setup.py chdir to RED_SPIDER_ROOT for more elegant program logic
Add installer directions to integration howto in Readme