avoid to enter non digit symbols in new_event table
add . and possibility to enter decimal numbers in new_event.html
add jquery.alphanum.js
add allowDigitsOnly.js
change styles in tables main.css
fixed error delete event confirmation dialog, moved numeric field validation to html(inline js), minor stylistic changes
Merge branch 'master' into gui

Conflicts:
	static_html/css/main.css
	static_html/new_event.html
Merge branch 'gui'
Merge branch 'master' of https://github.com/Bugeda/stadiumticket