Added parser for While. #12

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onewhl wants to merge 8 commits intoanlun:masterfrom

Commits on May 18, 2017

Added parser for L. Need ifp and whilep.
onewhl
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Added bio grammar for RNA stem loop.
onewhl
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Commits on May 19, 2017

Renamed grammar. Fixed parser.
onewhl
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Added ifp and whilep. Need more tests. It contains some bugs...
onewhl
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Commits on May 20, 2017

Fixed test
onewhl
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Commits on May 21, 2017

Added conjunctive grammar for basic structure of pseudoknots.
onewhl
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Commits on May 22, 2017

Changed length of string.
onewhl
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Added test program. Small fixes.It is work.
onewhl
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