Support MicroHs

[Yuras]

Half of the test suite is disabled because MicroHs doesn't provide Data.ByteString.Lazy. The rest fails in two places (augustss/MicroHs#275):

$ mhs -icompat -iportable_hspec -ilib -r spec/spec.hs 
-------------
anyWord8
should return the current byte
should fail on end of input
-------------
string
should consume the string
should fail on wrong input
-------------
take
should return the first n bytes
-------------
takeWhile
should return bytes according to the predicate
**FAILED**: expected Right "hello", but got Right ""
should return everything is predicate where becomes False
**FAILED**: expected Right "hello", but got Right ""
-------------
lookAhead
should return the next byte
should return Nothing on end of input
should not consume input
-------------
scanWith
should apply the scanner
should resupply scanner when necessary

[Yuras]

The whole test suit is green now.

[Yuras]

MicroHs chooses the installed module from bytestring instead of the local one, so I can't use Data.ByteString.Lazy