split EAAL version in separate file

This fix allows the gemspec file to only require enough to get EAAL::VERSION.
Current gemspec attempts to load all of EAAL, which in turns attempt to load its dependencies : it is a problem when installing EAAL for the first time, assuming deps are not available yet.

I used to have errors such as
```
There was a LoadError while loading eaal.gemspec: 
cannot load such file -- faraday from
/home/<privasnip>/bundler/gems/eaal-081113363e30/eaal.gemspec:3:in
`<main>'
```
when installing EAAL. Fixed with this patch.