isolate ship sizes as parameter for placement
add confirm-pop-up, fixes #42
Merge pull request #78 from jvoigtlaender/shipsizes

isolate ship sizes as parameter for placement
Merge pull request #79 from jvoigtlaender/master

effective caching of static files
added explicit export lists for all modules not containing any TH generated identifiers (closes #80)
Add an "About" page, refs #74. A better text has yet to be created... ;-)
rename .blueButton to .yellowButton which now makes more sense