ADD linux support for Intellij and AndroidStudio

I have updated `install.sh` script to check OS platform and install `Square` or `SquareAndroid` based on that.  
This is tested in ubuntu 13.04 for linux support.
![linux_support_prayagupd](https://cloud.githubusercontent.com/assets/978095/3211372/806cced4-ef13-11e3-932f-34370ad1cded.png)
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