removed src/Makefile and tweaked test/Makefile
Added non-dependent version of _$_
Added map∈ to Data.List
Fixed bug in Text.Lex

Skipped over bad characters at the end of a token.
Added 'this' to Text.Parse
Revert "Made parsing library universe polymorphic"

This reverts commit 793e32f3eada56dacb40a18bb33db61ba91d1dbf.
Return ⊤ from Text.Parse.this
Renamed Text.Parse.this to token
Merge branch 'master' into maint-2.4.0