Mini map base layer details externalised to config

Remove the hard coded URL to tile cache from JS files and can now be set
via config.
Uses closure style syntax for mini map configuration
Merge pull request #995 from aodn/move-minimap-baselayer-to-config

Mini map base layer details externalised to config
Moving https://github.com/aodn/aodn-portal/issues/978#issuecomment-36209399 to source code controlled doc.
Updated points around git branching after discussion with @dnahodil
Typo fix
Merge pull request #998 from aodn/build_process_no_branching

Build process no branching
Some tweaks to the build process document
Merge pull request #999 from aodn/build_document_tweaks

Some tweaks to the build process document