Removing cli.

With amber-cli 0.0.6 with -d option, it is possible
to compile with alternate Amber location.
bin/amberc{,.bat} scripts are left for this purpose
(they use global amberc but specify local amber to use).

(grunt task already had option to specify amber location)
Using amberc and amberc grunt task from amber-dev.
Using legacy test runner from amber-dev.
Merge pull request #976 from herby/remove-cli

Remove cli