Secure engineering

[otormaigh]

This pull request is in reponse to Issue #9

Some of the new implmented features are currently disabled because they would hinder development.

Additions:

• Adds ability for app to check if it is running on an emulator.
• Adds ability for app to check if the MD5 sum of the certificate it was signed with matches with the relevant credentials.
• Adds ability for app to check if it is running in debuggable mode.