Expose RRULE properties from RRuleIterator

[bcaller]

COUNT
FREQ
INTERVAL
UNTIL

[valentinbonneaud]

Can you add some unit tests around the new accessors?

[codecov-commenter]

Codecov Report

Merging #15 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master      #15   +/-   ##
=========================================
  Coverage     98.91%   98.91%           
- Complexity     1876     1880    +4     
=========================================
  Files            66       66           
  Lines          5505     5513    +8     
=========================================
+ Hits           5445     5453    +8     
  Misses           60       60           

Impacted Files	Coverage Δ	Complexity Δ
lib/Recur/RRuleIterator.php	99.19% <100.00%> (+0.01%)	218.00 <4.00> (+4.00)

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