Updated spec to include new trigger definition (see GitHub #64)
updated specification
added gemlock to gitignore
restructuring introduction
cleaned up structure of spec
added descriptions
cleaned up down to ports section
finished descriptions for Dynamic Regimes section
finished descriptions for the abstraction layer
added extensions section
removed appendix part
Merge branch 'updated_spec' of https://github.com/tclose/nineml into updated_spec
added descriptions to Component and Properties section
cleaned up population specification and started on Projection
specification
added descriptions to all sections of the specification
touched up draft and draft notes
made Text format consistent throughout the document
added bibtex
added spec bib
Merge remote-tracking branch 'incf/master' into updated_spec