add backslash and dot backslash cmds
NEWS: more on sympy 0.7.6
version bumps
Merge remote-tracking branch 'origin/master' into backslash

Conflicts:
	NEWS
fix NEWS file
Merge pull request #152 from maprieto/master

Adding some remarks on windows installation batch file
Add Andrés Prieto to CONTRIBUTORS

Welcome to octsympy!
windows packaging script: fix variable usage, sympy and pyexe bump
Merge branch 'prep'
update release date
update version for post v0.1.2
Merge remote-tracking branch 'origin/master' into backslash

Conflicts:
	NEWS
Merge pull request #156 from cbm755/backslash

Backslash