This commit also add a new string logintoaccount to make the login
button more clear.

Version bump as well.

Save a copy of the css file on the temp directory
to be used as a fallback when waiting for a theme to be compiled
and is not versioned in any way.

Merge branch 'MDL-59073_workshop_prevent_submission_without_content_or_file' of https://github.com/dannyjung90/moodle

Added a script to selectively compile theme CSS. In order to allow
compiling on per theme basis without purging all theme CSS in the
local cache I have made some changes to how CSS is compiled and
how it is accessed via local cache.

Switch back to GCE build infrastructure for Travis Builds and move
databases to RAM Disk.

This also adds a software entropy generator (haveged) which is
recommended when using a RAMdisk for the database.