Merge pull request #6 from dwtj/master

Merge ping fixes
Merge pull request #7 from dwtj/master

First draft implementation of `sentinel`.
Merge pull request #8 from dwtj/master

Merging David's bugfixing and sentinel implementation
Slight changes to OI functions
Merge pull request #2 from dwtj/master

Ping/Echo fix and generalization
Added echo test
Updated documentation
Sonar and IR reading
Added details to oi move and description of dump
Fixed Alex's name and alphabetized
Added to oi move
Refactored stuff, and split up the subsystems with current specifications.
Merge https://github.com/aore/mars-rover into aore-master
Merge branch 'master' of git://github.com/asr1/mars-rover into aore-master

Conflicts:
	rover/mars-rover.cproj
	rover/src/control.c