Replace lambda
Merge branch 'master' into working
Remove backend evaluation in reader
Removing print statements
Not using evaluator yet
Fix 24
Merge branch 'working'
Merge remote-tracking branch 'upstream/master'

Conflicts:
	grace/lang/reader.rkt
rewrap
Merge branch 'master' into working
Fix #40 and #41
Merge branch 'working'
Fix #41 and #42
Merge branch 'working'
Close #40. Concatenate added to strings
Concat can be called on top type and takes a top type. First ten tests changed to uncomment working tests
Merge branch 'working'