Remove critical sencha resources from .gitignore file

Sencha project requirements are a mix of static resources (like
bootstrap) and compiled resources (such as sassy css). This commit
adds only required static resources into the project by removing them
from the .gitignore file. This will allow anyone cloning the
repository to navigate to the project root and run 'sencha web start'
without build errors.
Merge pull request #1 from jhcarr/test-stratagem-JC

Remove critical sencha resources from .gitignore file