Save javascript model definitions

[ksibod]

Simple saving of model definitions in javascript for use in React-Native or node js. Saves all schema definitions into a single js file (It adds the Schema text after the actual table name). The schema consts are exported at the bottom of the file through module.exports. It might not handle every case but is at least a good start for exporting models from existing realm files!

[ksibod]

Added some style and syntax fixes.

[stel]

Thank you very much for this PR, @ksibod! Will take a closure look on it as soon as possible ;)

[ksibod]

@stel No problem, thanks!

[ksibod]

@stel Got it thanks! I'll make these changes and push again

[ksibod]

@stel Updated and pushed

[ksibod]

@stel I apologize, I missed one of the cases! That should do the trick.

[stel]

Awesome, @ksibod! Merging it now, thank you very much!