parse the clauses in expressions
Merge pull request #27 from liuhongchao/parse-clause-in-expression

parse the clauses in expressions
add rte supervisor module
add edts_rte as start point of rte functionality, whose purpose is to
start the edts_rte_sup module
start edts_rte_int_listner by edts_rte_server, therefore the edts_sup
would restart them together in case of a crash
Merge branch 'master' of https://github.com/liuhongchao/edts-rte into show_fun_in_one_buffer
add depth as part of key