added build libraries function calls

Signed-off-by: Michael Diener <dm.menthos@gmail.com>
added a dedicated RemoveFileError

Signed-off-by: Michael Diener <dm.menthos@gmail.com>
upon building of the javascript files, libraries will no longer
automatically be included

Signed-off-by: Michael Diener <dm.menthos@gmail.com>
removed general raise error, but rather raise a specific one (as intended)

Signed-off-by: Michael Diener <dm.menthos@gmail.com>
remove the existing built html file before rebuilding.

Signed-off-by: Michael Diener <dm.menthos@gmail.com>
take clean out of the build class

Signed-off-by: Michael Diener <dm.menthos@gmail.com>
updated executable

commands are now issued with a : notation. For example build:javascript.
Also updated the help to reflect the changes

Signed-off-by: Michael Diener <dm.menthos@gmail.com>