Remove install.md

Issue #101
This is being handled in build.md.
MOAR DOC CHANGES

Issues #87, #101

* Include make test(_lang) in both quick start sections, marked
optional but recommended
* Clarifications in make test, make test_lang sections
* Add make test_build section
* Add starsha infinite loop bug to troubleshooting
Merge pull request #129 from vmbrasseur/master

Additional build.md changes