Add open graph meta properties, fixes #36

Setting `this.PROPERTY` where `PROPERTY` is one of the below will
override what each of the meta is:
`description`, `socialTitle`, `url`

`socialTitle` will default to page title if not specified.
Fix incorrect description, ref #36
Combine create/edit logic into create only

To avoid variances in logic for something that is nearly identical, I
have combined this. `this.isEditing` indicates that the poll is being
edited and we can split the logic using that.
Limit length of questions, answers, and amount...

...of answers. 200 limit for question length and answer length. 20 limit
for number of answers. Fixes #40
Remove server side answer sorting

Sorting answers on server side throws off the order on graphs on refresh
which groups all high-vote answers together and all small-vote answers
are much harder to read.
Combine showResults/showVersus into one method

Logic is identical on both controller methods. `/results` will always
show the correct version now, regardless of versus option. `/versus`
will remain until v0.4.0 in case anyone has those links around.
Add terms and privacy page
Change poll data layout and add sharing links

Fixes #34
Force all users to non-beta tester, ref #47
Version bump v0.2.6