*** FIRST VERSION OF CI BUILD SCRIPT ***

- Provides build cache management to a remote location
- Provides automatic cashe repopulation
- See /fuel/ci/README
- Rebased to master
- Bug around cache handling fixed
- New option -r introduced to invoke external script/program instead of standard http(s)/fttp get and put, eg. scripts or programs to integrate with dropbox, or similar. The script needs to anheaer to curl argument list.
- Stefan Berg's comments implemented
- Fatih Degirmenci's comments implemented with one exemption: the revision state
  .iso naming convention still remains the same - we need to discuss this. With
  the implementation of Fatih's comments the build.sh argument structure is slightly
  changed, please see ./build.sh -h

TODO:
- Further testing
- Finalize cache invalidation logic
- Make refactoring

JIRA:

Change-Id: I4efdbdd10f726c0a3229849a63040b6d2702db5c
Signed-off-by: Jonas Bjurel <jonas.bjurel@ericsson.com>