add possibility to load templates from local files

[trusch]

update loader package to:

• support file:// scheme, which loads templates from disk
• add support for http:// scheme (instead of only checking for https:// before initiating a http request)

[coveralls]

Pull Request Test Coverage Report for Build 13

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.365%

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Totals
Change from base Build 12:	0.0%
Covered Lines:	197
Relevant Lines:	211

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💛 - Coveralls

[hexdigest]

Thanks @trusch !