fix(epw): fixed bug in sky_temperature method

[mostaphaRoudsari]

We have forgotten to change .values to .data after making the change in DataCollection class.

Added an extra test to catch this issue in the future.

[coveralls]

Pull Request Test Coverage Report for Build 253

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 24 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-0.3%) to 75.373%

---

Files with Coverage Reduction	New Missed Lines	%
ladybug/epw.py	2	81.12%
ladybug/datacollection.py	2	50.0%
ladybug/sunpath.py	4	62.46%
ladybug/wea.py	5	88.52%
ladybug/futil.py	11	56.76%

Totals
Change from base Build 246:	-0.3%
Covered Lines:	2678
Relevant Lines:	3553

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 253

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 24 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-0.3%) to 75.373%

---

Files with Coverage Reduction	New Missed Lines	%
ladybug/epw.py	2	81.12%
ladybug/datacollection.py	2	50.0%
ladybug/sunpath.py	4	62.46%
ladybug/wea.py	5	88.52%
ladybug/futil.py	11	56.76%

Totals
Change from base Build 246:	-0.3%
Covered Lines:	2678
Relevant Lines:	3553

---

💛 - Coveralls

[chriswmackey]

Thanks for catching this one, @mostaphaRoudsari . This one was back from before we switched the data and value properties to be what they should be.