CC-54 - closing inputstreams after use

Closing the inputstreams after properties are read
CC-54 - closing input streams

all inputstreams should be closed when not using them any longer
Revert "CC-54 - closing input streams"

This reverts commit dbb8864e3b1be2ada87c8a608e172ff42f67a8e3.
CC-54 - closing inputStream in exists()
Merge pull request #9 from ahaarrestad/CC-54

Cc 54
o added some null checks,
o upped version
CC-55 Implement a JUnit Rule for test support

This makes it easier to use Constretto's support for handling @Tags
on a test class. Several JUnit Rules can be used at the same time,
while JUnit Runners (like ConstrettoJUnit4ClassRunner) is harder to
compose.

JUnit got support for Rules in version 4.7, so the JUnit dependency
has been upgraded to this.
Merge pull request #10 from stigkj/master

CC-55 Implement a JUnit Rule for test support
Create a proper message when a ConstrettoConversionException is thrown since this is what will be shown when using Spring.
Merge pull request #11 from xoiram/a8d7963a1e6a812eb0eeac6525c94c71a96ddc49

Sensible message when throwing a ConstrettoExpressionException