v0.4.0

HerbGrammar v0.4.0

Diff since v0.3.0

Merged pull requests:

• Bug/csgrammar macro returns object not expr (#75) (@ReubenJ)
• [v0.2.x] Allow insert!ion of AbstractRuleNodes (#77) (@ReubenJ)
• Remove hasdynamicvalue function calls from rulenode2expr functions (#79) (@To5BG)
• Remove double normalization of probabilistic grammars (#82) (@nicolaefilat)
• HerbGrammar v0.4.0 (#83) (@ReubenJ)
• Remove line numbers in PCSG construction (#84) (@ReubenJ)