Replace phar build script with box-project/box2 build tool.

[tomzx]

Adds a box.json file that should replace the configuration used in the build file.
Removes the old build file (since it is replaced by the configuration file).

File size goes from 3 MB to ~485 KB.

Reference: #190

[antonmedv]

What if i add $phar->compressFiles(Phar::GZ); to my build script?
Now deployer.org site uses my build script, so we need to refactoring them too.
What is the benefit ща migration to box2?

[antonmedv]

New size of deployer.phar 825KB now.

I think we need to reduce number of dependencies.

[gordalina]

Nice job @tomzx
Box really makes it simple to package an app.

I would like to add that enabling gzip compression could lead to php installations (without gzip extension enable), to fail loading the phar. Also Composer had an issue with this before.

Regarding the size of the phar, I guess we (developers) have reasonably fast bandwidth to transfer a larger file, thus making it less relevant.

[tomzx]

@Elfet Why do you prefer your own build script to using a library that is used/tested by many? What would make you change your mind?

[antonmedv]

Hmmm, i'll think about it :)

[gpupo]

I agree with @tomzx. Nice job

[antonmedv]

Box awesome project, but i do not what to touch what's already good working.
Also i do not see any cons of this.