Merge pull request #16 from OfficeDev/dev

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fixed bug with onprem creation of taxonomy groups.

1) termStore.GetGroup(groupId) does not work. had to use termStore.Groups.GetById(groupId) instead.

2)also removed creation of new guids for each group/termset/term. this was causing the subsequent terms to not find the group and termset already created.
fixed bug: “Specified Method Not Supported” in linq expression
Merge remote-tracking branch 'contributor/master' into pr277
Merge of pr 277 - did not take over the removal of new guid creation as this breaks the unit tests. Fix should be to refresh the caches as this will ensure the newly created terms can be found.