=== 4.9.0 / 2017-04-13
* 9 minor enhancements:
* Added Sexp.depth
* Added Sexp.sexp_type=
* Cache Sexp.line_max. Massively speeds up large flay runs.
* Cleaned up SexpProcessor.process handling of result node type.
* Extend pt_testcase for ruby 2.4 tests.
* Extended Sexp.method_missing to only print on every invocation if $VERBOSE=1
* Extended Sexp.method_missing to warn if the expected sub-sexp is not found.
* Rewrote Sexp.mass to be MUCH faster. Helps tremendously with flay on large files.
* Warn that Sexp#method_missing was tripped if $DEBUG.
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