doc: improve write style consistency
doc: improve write style consistency

Add more consistent verbs to each changelog entry, add missing periods,
trim white-space and fix sorting of entries.

PR-URL: https://github.com/iojs/io.js/pull/360
Reviewed-By: Rod Vagg <f9f03903429036ef609ed7ca822fddfa76155c29@vagg.org>

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node