Updated to use OTRecordList (in OT develop branch)

Signed-off-by: FellowTraveler <F3llowTraveler@gmail.com>
Check for gcc > 4.7 (c++11 or c++03 build).
Update doc/INSTALL-unix.txt.
Merge pull request #88 from randy-waterhouse/master

linux qmake check for gcc < 4.7
Merge pull request #89 from FellowTraveler/master

Updated to use OTRecordList (in OT develop branch)