3 new locales and change to isoMsecFormat and isoString

WARNING Format.isoString and Format.isoMsecFormat output changed.

It is not a type change so I can't just force a major version jump.
Have modified isoString and isoMsecFormat to output timezone offsets including a ":" the "%:z" date format option. as this appears to be more supported in general.

@cuducos reported this problem with safari parsing isoString result see #29

Thanks for new locales to

• @cuducos for Portugese pt_br
• @stil4m for Dutch nl_nl
• @karls for Estonian et_ee

Update for Elm 0.18.

Thanks to @joeandaverde who did all the work.
I just checked tests in the 3 time zones test run in and bumped version.

Format 2 digit year, French day suffix.

Thank you @brunogirin for French dayOfMonthWithSuffix.
Thank you @mosho1 for 2 digit year format symbol.

Add Romanian translation.

Thank you @chalmagean.

New format codes for English.

These codes output only decimal integer in French, Finish and Polish at the moment.

For English.

• %-@d - Day of Month with language idiom suffix Day of month, e.g "2nd"
  • this currently only does this in english language
• %@e - Space-padded Day of Month with language idiom suffix, e.g " 2nd"
  • this currently only does this in english language

Fix dateFromFields #17

fix(dateFromFields): day light saving compensation

It now compensates for the difference between day light saving offset at epoch date verse day light saving offset now.
test(CreateTests): Now filters out tests not in current time zone so no errors appear any more for other time zones. This does mean that to get clean bill of health for tests they need to be run in 3 time zones at least.  Sydney, Brisbane, NewFoundland

Add Finnish locale

Release 7.2.0 with finnish locale

doc(LICENSE): correct
doc(TimeUnit): correct
feat(Configs): add finnish

Add Polish locale

Thanks @bartsokol

Add Duration DeltaRecord zeroDelta and diff.

Add Duration DeltaRecord zeroDelta and diff. Bump version to 7.0.0

feat(Duration): add diff DeltaRecord zeroDelta
test(Duration): add for diff
style(Period): change indentifier name

Version bump for with updated French locale names and exposed French config

Thankyou @MangelMaxime