Created by: jazzychad
Currently make bootstrap recompiles all js, css, and img files into the bootstrap directory on every invocation. This is very costly when using Bootstrap as a submodule in another project during the compile phase. This update adds new Makefile targets which add file dependency for each asset type (css, js, img) which will only recompile the specific asset type if associated input sources are changed. This saves valuable time during recompiles (of Bootstrap itself and of super-projects).