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This pull request partly updates and partly documents the toolchain.
The previous Eclipse/android plugin has been migrated to a new Android Studio project. A new version of the unity/android jar library file has been added to this project to support unity 2017.3
The android studio project creates .aar files which must be 'unzip'd to get the constituent jar files needed in the unity packages.
The unix shell script has been modified to build the new android studio project and extract its contents before moving the jar files into the android plugin folder structure (much as it did before)
More detail about the toolchain (meaning the process of compiling and building the .jar's, collecting files and finally packaging them into the .unitypackage file) has been added to the 'readme'