Fixes #7
--timber option for starttheme doesn't exist anymore since it has been the default. To start a classic wp theme (doesn't use timber) then you need to pass the --classic option. Also README.md was updated the reflect changes from a previous comment. Mainly renaming the 2 commands to starttheme and startplugin
Merge pull request #8 from raulchacon/issue#7

Fixes #7