FLUID-5274: Added an "cwd" option to specify a path that all source files and directories can be relative to.
FLUID-5274: Improved README.
FLUID-5274: Improved README for the "cwd" option.
FLUID-5274: Moved the documentation for "cwd" out of options section and into usage examples.
FLUID-5274: Adjustments in README.
Merge remote-tracking branch 'cindyli/FLUID-5274'

* cindyli/FLUID-5274:
  FLUID-5274: Adjustments in README.
  FLUID-5274: Moved the documentation for "cwd" out of options section and into usage examples.
  FLUID-5274: Improved README for the "cwd" option.
  FLUID-5274: Improved README.
  FLUID-5274: Added an "cwd" option to specify a path that all source files and directories can be relative to.