Updated mercurial ignores
Updated mercurial ignores

.hgignore
* removed output_file.py - no longer used
* removed RELEASE.txt - release instructions were moved to ./Releases
* added ./Releases - backup folder of releases. Doesn't need to be revision-controlled.

assarbad/pypreprocessor,nanonyme/pypreprocessor,evanplaice/pypreprocessor,zaxebo1/pypreprocessor,hendiol/pypreprocessor,mrjimenez/pypreprocessor,sylvandb/pypreprocessor