Improve (Modals): Format indentation style.
Improve (Modal): Add default variables and mixing.

In the case that this isn’t used with a bootstrap environment, this
chunk of code will take care of defining all the used variables so that
LESS won’t die a horrible death.
Improve (Modals): Fix spelling from CR.
Merge pull request #3 from betaorbust/modal-separation--jf

<Fix> Give modal LESS file defaults in case BS3 is not available.