Merge pull request #11 from FullSimplex/master

Minor changes about the about
#6 append date and time to default save filename

Also:
* increase width of saveName input element to accommodate longer default filename
* add .json file extension to default filename, so that it shows in the save popup window.
* strip dangerous characters from filename before it is displayed in the save popup window
#16 Bad character data in the SQL database script

â€™ should have been escaped single quotes
#17 default export file name should be character name

* follow implementation of #6
* create a class to encapsulate file-related code that is common to all exporters

Also:
* output 500 status if export fails instead of blank file
adding regular ammo to db
Merge pull request #18 from boomzilla/master

adding regular ammo to db
remade the pdf export with FPDF.
change the button action for the new exporter.
cleanup the export folder from all the old and no more needed stuff.