Minor fix to operator ^
got rid of commented-out lines in exponentiation_expr
missing quotation mark in Stan BNF
fix formatting of some inline code
Merge pull request #713 from stan-dev/feature/minor-fix-for-pow-infix

Minor fix to operator ^
Merge pull request #720 from jrnold/doc-typo-in-stan-bnf

missing quotation mark in Stan BNF
Typo fix: delcare->declare
Merge pull request #721 from jrnold/doc-typo-boolean-operator

fix formatting of some inline code; looks good to me
Merge pull request #730 from gokceneraslan/patch-1

looks good to me;  Typo fix: delcare->declare
Merge branch 'develop' of https://github.com/stan-dev/stan into bugfix/issue-723-functions-in-23
hopefully final patch for issue #723 with model test and moving scope of reset on symbol table to the parser from the compiler