Increment library version to 0.8.1

[ekigamba]

• Increment library version
• Enable kujaku library release imports on the sample module

This enables Kujaku to load tiles locally by using a http server as seen in #322

[coveralls]

Pull Request Test Coverage Report for Build 1539

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 22 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.4%) to 52.842%

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Files with Coverage Reduction	New Missed Lines	%
library/src/main/java/io/ona/kujaku/KujakuLibrary.java	10	0.0%
library/src/main/java/io/ona/kujaku/domain/Point.java	12	0.0%
<!--	Total:	22		-->

Totals
Change from base Build 1537:	-0.4%
Covered Lines:	3021
Relevant Lines:	5717

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💛 - Coveralls