[EN DateTimeV2] Fix for wrongly recognized DateTime entities with "." splitter (#908)

[aitelint]

Fix for issues reported in #908.

We did not update the pattern "on 5.11" which is currently parsed as "May 11th" instead of "Nov 5th" (as requested in the issue). It seems to be a breaking change because there are test cases that rely on the current implementation e.g.: "Cortana, please set up a Skype call sometime on Friday 7.6 with Jim." -> "July 6th" "This task should be done on 5.12" -> "May 12th" Should we modify the current behaviour?

Test cases added to DateTimeModel.

[tellarin]

@LionbridgeCSII Same here. Thanks.

[aitelint]

@LionbridgeCSII Same here. Thanks.

resolved.

[tellarin]

@LionbridgeCSII Sorry. Simple conflicts again.