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v1.2.0 (#6)

luav 1.1.7

Add changelog

Refactor tests and set new version

Add luav doc

AWK scripts

* Moved complex awk scripts to libexec/awk
* Simplified update index awk script (only awk!)
* Simplified help message extractor awk script
* Added tgts command for extracting targets from Makefiles

Removed Makefile

* Moved text processing to libexec/update

Added completions for 'rm' and 'comp' commands

Updated README

* compgen is a builtin command from bash