Merge pull request #521 from stqism/docs

Updated the INSTALL.md to reflect the new build system
This fixes out of tree builds

Should be references from top_builddir
Merge pull request #522 from jin-eld/fix-out-of-tree-builds

This fixes out of tree builds
Fix typo in configure script help text

It's "bootstrap", not "boostrap" :P
Merge pull request #523 from jin-eld/fix-configure-help-typo

Fix typo in configure script help text