…sues, instead of closed only - the new GH query syntax now permits this.
- CONTRIBUTING.md: big revamp. Broaden scope; include bug & pull request info at top (since it's linked from those creation pages); clean up wording; remove some info that's redundant with other pages & link to them instead - README.md: soften "it's early" messaging a tad; emphasize CONTRIBUTING.md more; revamp bug-filing section; add small "What's Brackets working on next?" section - nls/README.md: tighten wording; update list of languages - Getting Started: fix typos - LanguageManager: fix incorrect statement about extensibility
…fore starting to work on it.