- Make it compilable with new rust changes.
- add a module cmd_reader.
- some improvements.
Set processes stdios before executing its.
avoid run-time failure when the input command is empty
Corrige version given by "-h" or "-v"
when the program argument 'file' can't be open, do not fail!() but print a message and return to the main.
Make the branch 'parser' compilable.

Merge branch 'master' of github.com:DBarthe/rush into parser

Conflicts:
	src/rush/mod.rs
	src/rush/shell.rs