add mono-utils for install.

Signed-off-by: Bao Haojun <baohaojun@gmail.com>
add custom theme

Signed-off-by: Bao Haojun <baohaojun@gmail.com>
bin/Linux/after-check-out.sh: add nuget support

Signed-off-by: Bao Haojun <baohaojun@gmail.com>