DOC: updated readme
Finish semantic type system section
DOC: add plugin system section
DOC: start reformatting beginning sections < 80
DOC: Finish reformatting to < 80 chars
DOC: cleanup to existing text, filled out more details throughout
DOC: add intro paragraph to executive summary
DOC: clean up roadmap based on comments from @gregcaporaso and @ebolyen
MAINT/DOC: Move roadmap doc into ROADMAP.md.
DOC/MAINT: fix broken section link
Merge pull request #4 from ebolyen/exec_summary

Proposed QIIME2 Roadmap