evolvestate: add a class to wrap the state of `hg evolve` command
This patch adds a new file which contains a class which will act as a wrapper
for the data to be stored or used during the `hg evolve` command. This patch
just introduces the file and does not use it at the moment. The upcoming patches
will start using it.
syntax: re
/figures/[^/]+\.png$
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
^tests/.*\.err$
^tests/easy_run.sh$
^build/
^dist/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$
tests/\.testtimes
^docs/training/graphs/
^docs/training/html/
^docs/training/index.html
^docs/training/graphviz-images/
^docs/training/img/
^docs/training/output/
^docs/training/pandocfilters/