Added new assert functions.  Now need to make sure they work.
added inherit checks.
Merge remote branch 'upstream/master' into assert-extras
Merge remote branch 'upstream/master'
Added assert for isBuffer

Added assert for isBuffer using the Buffer.isBuffer check.  Also merged up
to current master.
Merge pull request #7 from godsflaw/master

Added asserts from Christian Johansen's Test-Driven Javascript Development book