Add fusion versions of many of the combinators

+ Add the same GHC options as used in conduit ("-Wall -O2 -rtsopts")

+ Adds a 'splitOnUnboundedE' function, which generalizes
'linesUnbounded' / 'linesUnboundedAscii'.

+ For consistency with adding 'splitOnUnboundedE', also adds a
'takeExactlyUntilE' function, which generalizes 'line' / 'lineAscii'.

+ Adds a 'foldl1' function, which is used to implement things like
maximum and minimum.
Add quickcheck tests for stream version of combinators

+ fix issues found
Add stream fusion for sinkLazy / sinkLazyBuilder
Add fusion for the remaining fusion-able operators
Fix install from sdist by adding fusion-macros.h to extra-source-files