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Fix for #26: handle overflow exceptions properly... (#27)

* Fix for #26: handle overflow exceptions properly and try a better encoding.

* More efficient encoding of floats

Follows recommendation in _draft_ CBOR spec:

https://tools.ietf.org/html/draft-ietf-cbor-7049bis-04#page-32

   If a protocol allows for IEEE floats, then additional
   canonicalization rules might need to be added.  One example rule
   might be to have all floats start as a 64-bit float, then do a test
   conversion to a 32-bit float; if the result is the same numeric
   value, use the shorter value and repeat the process with a test
   conversion to a 16-bit float.  (This rule selects 16-bit float for
   positive and negative Infinity as well.)  Also, there are many
   representations for NaN.  If NaN is an allowed value, it must always
   be represented as 0xf97e00.

* Explicitly test float16 packing to improve coverage

* Exclude empty compat functions from coverage report

25 of 25 new or added lines in 3 files covered. (100.0%)

534 of 535 relevant lines covered (99.81%)

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