Revert "Add newline escape to rst kv code."

This reverts commit a63019ad94bc0ef804908669e4130ad458c8ed17.
Revert "Fix multiple line, without newline escape code."

This reverts commit 03ab508ad2b7c248e0474059963072ddb5f43b96.
Revert "Update lang to allow comments on same line as code."

This reverts commit d2df17a596cd178f3219e8abd3124b16acb854c0.

Conflicts:
	kivy/lang.py