Move gulp-jasmine to jasmine-npm

Since minijasminenode2 doesn't seem to be supported anymore, and I
needed the beforeAll added to Jasmine 2.1, this is a first shot at
moving gulp-jasmine to the official implementation of jasmine for node.
I haven't tried to add custom reporters, and the default reporter
doesn't support isVerbose and includeStackTrace, so I deactivated these
options, but the rest looks functional enough. Haven't implemented a
gulp module before, so let me know if I can do anything better.