Updated README to be more useful.

Added Java install. Added Android SDK install with bashrc edit. Added updated NodeJS installed method. Added NPM update method. Added Cordova install.

README.md

@@ -52,13 +52,31 @@ This project is licensed under the AGPLv3 free software license. See license for
 ##Contributing
 
 You will need to a few tools in order to contribute to this project:
+#### Java
+Ubuntu:
+```
+sudo add-apt-repository ppa:webupd8team/java
+sudo apt-get update
+sudo apt-get install oracle-java8-installer
+```
+
+#### Android SDK / Studio
+Download and run the installer
+https://developer.android.com/studio/index.html#downloads
+For Ubuntu you will need to add below lines to bashrc after running the bash installer for Android Studio.
+Ubuntu:
+```
+sudo gedit .bashrc
+export ANDROID_HOME=~/Android/Sdk
+export PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools
+```
 
-#### NPM
+#### NodeJS and NPM
 
 Ubuntu:
 ```
-curl -sL https://deb.nodesource.com/setup | sudo bash -
-sudo apt-get install -y nodejs
+sudo apt-get install nodejs nodejs-legacy npm
+sudo npm install npm@latest -g
 ```
 
 Mac:
@@ -70,6 +88,11 @@ Don't have brew?
 ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
 ```
 
+#### Cordova
+```
+sudo npm install -g cordova
+```
+
 #### Grunt
 ```
 sudo npm -g install grunt-cli