Tighten lexing of T_TEXT nodes.
Tighten lexing of T_TEXT nodes.

Thanks to some heavy rubberducking with @whitequark the lexer is now a little
bit better at lexing T_TEXT nodes. For example, previously the following could
not be lexed properly:

    "foo < bar"

There might still be some tweaking to do but we're getting there.

dfockler/oga,jeffreybaird/oga,jeffreybaird/oga,dfockler/oga,altmetric/oga,jeffreybaird/oga,altmetric/oga,altmetric/oga,dfockler/oga,YorickPeterse/oga,ttasanen/oga,ttasanen/oga,jeffreybaird/oga,YorickPeterse/oga,ttasanen/oga,YorickPeterse/oga,altmetric/oga,dfockler/oga,YorickPeterse/oga,ttasanen/oga,altmetric/oga,YorickPeterse/oga,jeffreybaird/oga,dfockler/oga,ttasanen/oga