Move all Processors into TermApp module

You can see actual diff with `git diff -b`. Also, if there is another good way to represent:
``` ruby
"TermApp::#{name.to_s.classify}".constantize
```
then please let me know. I found
``` irb
>> TermApp::Processor.name.deconstantize
=> "TermApp"
```
but it's hard to use in `spec/support/termapp_helper.rb`.