Add license field.
Add vibe.d as an optional dependency so that Have_vibe_d gets defined for separate builds (as for "dub generate visuald").
Fix compiler error for the latest vibe.d master. Fixes #25.
Remove checking _valid (which no longer exists) from execFunction and execTuple.
Merge pull request #26 from schancel/fix_valid

Remove checking _valid (which no longer exists) from execFunction and ex...
Added a few missing casts.
Merge remote-tracking branch 'upstream/master'
Merge pull request #27 from ArjanKn/master

Added 2 missing casts reported as errrors by DMD-2.065 head.
Add .gitignore
Merge pull request #32 from Geod24/add-gitignore

[Trivial]Add gitignore
Error message was not displayed, because IFTI doesn't work with classes.

dmd 2.065.0 issued 'Error: class mysql.db.MysqlDB() is used as a type' instead of the static assert.
As there is AFAIK no way to trigger the static assert on class instantiation, this turn it into an undefined symbol.
Merge pull request #31 from Geod24/mysql-error-message

[Trivial] Error message was not displayed