Remove zero-width spaces

cf. http://en.wikipedia.org/wiki/Zero-width_space
Merge pull request #820 from basho/bugfix/remove-zero-width-spaces

Remove zero-width spaces

Reviewed-by: kuenishi
Add support for Cache-Control header
Separte the revised managerial aspects of the GC daemon from the GC
worker. GC worker resides in new module riak_cs_gc_worker.
Finish seperation of concerns among gc daemon and workers, finish
refactoring daemon state machine, and finish build out of worker state
machine.
File cleanup
Start updates to riak_cs_gc_d_eqc
Merge pull request #821 from junamai2000/develop

Add support for Cache-Control header

Reviewed-by: kuenishi
Fix riak-cs-gc status output

Also remove two unused files
Change state names of eqc_fsm according to riak_cs_gc_d
Simplify weights
Refactor riak_cs_gc_d_eqc
Refactor

Remove unused command handling
Avoid O(N^2)
Add pause handling to start batch command

Also add some error returns
Add eqc test case for gc daemon and workers
add cluster-info
Remove unused record field, add some document and calm dialyzer
Strict interval/leeway validation
Do not start worker for empty key
add riak-cs-cinfo to package_commands.