* Add/document cmake variables that control various installation path
  options. See README.md for examples.
* Updated README a bit
* Hide helpers.h from include requirements
* Install things to real paths in a proper way. Header files will go
  into <prefix>/share/bcc/include.
* Move the kickstart script readme to its own directory.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>