Assets handling in stage/dist

File path resolution in jar tends to differ from the way unix
filesystems handle them.
When looking for foo//bar, unix filesystems does no difference to
foo/bar. Jar files makes a difference between both which causes trouble
between play run and play stage environments.
updated version of SnakeYAML to 1.13
[#2141] Test emails with apostrophes
Fixed anorm specs to fix build
Merge pull request #2104 from baloo/improvements/unix-fs-jar-files

Assets handling in stage/dist
Merge pull request #2144 from baloo/improvements/2141-email-apostrophes

[#2141] Test emails with apostrophes
Merge pull request #2139 from codingricky/upgrade-snakeyaml

updated version of SnakeYAML to 1.13
Anorm `?` parser should not hide type/sql mapping error, just ignore null/missing column.
Merge pull request #2142 from cchantep/anorm-optparser

Anorm `?` parser should not hide type/sql mapping error
Merge commit '3fe7d53649f5cda3faef920b7bcef3af21d55259'