Closes square#46. Fixes square#47. Prior to this commit the gem failed to validate the RRULE's syntax: * If a keyword was misspelled, it would *silently* be ignored * If a keyword appeared multiple times only the last occurance was used * If the mutually exclusive keywords COUNT and UNTIL were used together then no exception was raised ```ruby > rrule = RRule.parse('FREQ=DAILY;COUNT=3;COUNT=7;UNTIL=20200302;INTERVALLLLL=9') => #<RRule::Rule:0x000055db33885018 ... > rrule.instance_variable_get(:@options) => {:interval=>1, :wkst=>1, :freq=>"DAILY", :count=>7, :until=>2020-03-02 00:00:00 +0100, ... ``` Therefore we add a validating parser with comprehensive error messages: ```ruby > rrule = RRule.parse('FREQ=DAILY;COUNT=3;COUNT=7;UNTIL=20200302;INTERVALLLLL=9') Traceback (most recent call last): ... RRule::InvalidRRule (SyntaxError) * unknown keyword 'INTERVALLLLL' at position 42: 'FREQ=DAILY;COUNT=3;COUNT=7;UNTIL=20200302;INTERVALLLLL=9' ^^^^^^^^^^^^ * keyword 'COUNT' appeared more than once at positions 11 and 19: 'FREQ=DAILY;COUNT=3;COUNT=7;UNTIL=20200302;INTERVALLLLL=9' ^^^^^ ^^^^^ * keywords 'COUNT' and 'UNTIL' are mutually exclusive at positions 11, 19 and 27: 'FREQ=DAILY;COUNT=3;COUNT=7;UNTIL=20200302;INTERVALLLLL=9' ^^^^^ ^^^^^ ^^^^^ ```

Request for RRULE validity checker #47

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