fixing colored output of Makefile

The colored output is broken when using Zsh.

\033[32;01m==> Installing dependencies\033[0m
\033[32;01m==> Building\033[0m

After adding the parameter -e to echo I get the expected green lines.
Merge pull request #991 from berendt/fixing-colored-output-of-makefile

fixing colored output of Makefile