Change font size for GUI

After some time debating I decided to go with a smaller font. This allows me to
have more text on any screen and when I'm using my laptop I don't feel like a
person that needs all the texts bigger in order to see things in front of me :)
Make Gradle files recognizable by Vim

Since .gradle files are simply Groovy files, mas vim recognize this.
Fix Greper mappings.

[Problem]
When pressing ,sa in normal mode or visual mode, the Greper command failed. On
Graper documentation the author state that using nnoremap to map its utilities
does not work and I was using exactly that.

[Solution]
Change the nnoremap to nmap on Greper mappings.
Also, I changed the Greper call in visual mode to use the /patern/ search
instead of "patern".
Fix Rooter paterns.

[Problem]
I was using a to broad condition to define the root of a project and this was
causing Rooter to believe that a child directory should be considered a root one
(more specifically Android projects).

[Solution]
Only consider root directory if we find a build script file (Makefile,
build.gradle, etc.) in it. Also, we check for VCS patters like .git, .hg, etc.