JetBrains recently released a new C/C++ IDE: CLion

Intellij's iml file can be anywhere on the path.
This is true for multi-module maven project where each module has its own $projectName.iml file in its own directory.

These are relatively new, the crashlytics.properties file contains the secret and can [alternatively](https://plus.google.com/+AntonioBertucci/posts/S9krjvXfgfm) contain the apikey to rid your repo of the extra strings file.

Amends #1165

guess that root iml needs to be ignored and others need to be shared

removed the iml filter - this is my current best understanding of the docs, but I'm still unsure

To clarify when to ignore/include *.imls as per https://intellij-support.jetbrains.com/entries/23393067

also added optionals from the same

Fixes #1090 - this is the part of that PR that seems justified.

* Remove AndroidStudio.gitignore in favor of adding the
  change needed to the Global/JetBrains.gitignore file

Add plugin file description for JIRA config file containing username and password