chore(build): switch build to grunt 0.4

[pkozlowski-opensource]

This is first-shot attempt at switching our build to Grunt 0.4.x. It doesn't attempt to refactor / simplify the build (which we probably could do with using grunt plugins for testacular, html2js etc. instead of providing our own implementation).

The immediate goal for me was to have a working build on the Jenkins-CI server which is broken atm, see: See #207

[pkozlowski-opensource]

@angular-ui/bootstrap would be superb if someone could have a look and scream if there are bad parts in there. I would like to merge this PR asap as currently our build is broken on the Jenkins-CI and Igor did necessary changes already to have some of the npm modules installed locally.

[ajoslin]

I can check it out tonight.

[joshdmiller]

I will also take a look this evening.

[petebacondarwin]

Didn't try to run it but looks generally ok to me.

[ajoslin]

I didn't end up having access to my dev computer so I can't run it. But it LGTM too.

I can check it tomorrow or thursday if it's still not merged

[pkozlowski-opensource]

Good catch @gmp26 !

I'm going to change the commit with this finding and merge it to unblock the build.

[pkozlowski-opensource]

Landed as 98b5f8e and the CI build is green :-)
We are on the Grunt 0.4 and chacked-in markdown npm module went away :-)