Add constitution

This adds our constitution in markdown format.

I went from our constitution posted [here][] -> Word Document -> Plain text -> Markdown format in about 5 minutes. Not to mention I used [doctoc][] to create a nice table of contents. This means that we can use a url to directly link to a specific section our of constitution. No more telling people to go to section b of a 1223, just give them a link.

Related #4, #3

@clharman, please review this pull request and merge it if you like it.

[doctoc]: https://github.com/thlorenz/doctoc
[here]: https://doc-10-14-docsviewer.googleusercontent.com/viewer/securedownload/7voq4n3do1lfhjos2t05nkdmpfdepoma/fmlmh2q049v77l3em09v49bho9uba7nj/1405285200000/c2l0ZXM=/AGZ5hq9kwb415Lmokdb5PfGPh8Cn/ZFcxcFkyZ3VaV1IxZkdWdVoybHVMWFZ0WldOOFozZzZNakE1TkdNME5HTTNNR1ZtTURFNU5R?docid=ee9649d026b5ac6906fe686a1f9792b0%7Ccc7dbc72089e15d4916181d76086ef0f&chan=EwAAAAVo2HMwq6xM6MiVBPFqrmhlQEbdsqMFy7XVi6PMsT4s&dom=umich.edu&sec=AHSqidaZwKPgoF6bE6hQPcDKLOEDF5pJKXegT9GcB3P5aazL-mgHqYQ2ej54A87KjO2u76SnOMmq&a=gp&filename=UMECConstitutionMay14.pdf&nonce=5d73oevn2dh0s&user=AGZ5hq9kwb415Lmokdb5PfGPh8Cn&hash=3fsrbo7slv5j1p773rh7pvmvoib12dkl