Add save/load functionality

[lowrykun]

Sorry for the delay...

[staabm]

Will give it a try tomorrow

[staabm]

Justed tested the current version. Here is a Screenshot of how the changes look like ATM:

Feature wise:

• atm occurs a js syntax error, please fix that

SyntaxError: missing ) after argument list php-console.js:201:9
TypeError: $.console is not a function

• after fixing this error the feature itself works for me in FF41 & Chrome44

UI wise:

• the new save/load feature should be more separated from the current "reset" feature
• nit: maybe it should be named import/export instead of save/load?
• After running the script the UI gets even more crowded with the memory informatioin, see
• When clicking "load" and the editor already contains source-code it would be good if we could add a confirm dialog before overwriting the current sources

general discussion: maybe it would make sense to export/import the file into Gists instead of local files?

Summary: the feature itself is nice, but the UI needs some polish before this can be merged.

Thanks for your work so far.

[staabm]

@lowrykun any updates on this ?