Rewrite .. operator

[dpsanders]

Rewrites a..b to not use @interval. Does this by using convert(Interval, a) and convert(Interval, b).

[dpsanders]

Fixes #172 and #203.

[coveralls]

Coverage decreased (-0.07%) to 90.385% when pulling 3afab5bf949068f841aec3707514a73b7e5b06ef on rewrite_dotdot into 69bd570ef59dce58771847575258c7f2b5e78708 on master.

[codecov-io]

Codecov Report

Merging #209 into master will increase coverage by 0.02%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #209      +/-   ##
==========================================
+ Coverage   90.45%   90.48%   +0.02%     
==========================================
  Files          23       23              
  Lines         985      988       +3     
==========================================
+ Hits          891      894       +3     
  Misses         94       94

Impacted Files	Coverage Δ
src/intervals/intervals.jl	100% <100%> (ø)	:white_check_mark:
src/intervals/conversion.jl	79.31% <100%> (+2.38%)	:white_check_mark:

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[coveralls]

Coverage increased (+0.03%) to 90.486% when pulling fbad14bc9c77d33d18942450435a57c66524cf60 on rewrite_dotdot into 69bd570ef59dce58771847575258c7f2b5e78708 on master.

[coveralls]

Coverage increased (+0.03%) to 90.486% when pulling fbad14bc9c77d33d18942450435a57c66524cf60 on rewrite_dotdot into 69bd570ef59dce58771847575258c7f2b5e78708 on master.

[coveralls]

Coverage increased (+0.03%) to 90.486% when pulling c74f6f9a8fdbb1a675068172af580e7bebf4867b on rewrite_dotdot into 69bd570ef59dce58771847575258c7f2b5e78708 on master.

[coveralls]

Coverage increased (+0.03%) to 90.486% when pulling c74f6f9a8fdbb1a675068172af580e7bebf4867b on rewrite_dotdot into 69bd570ef59dce58771847575258c7f2b5e78708 on master.

[lbenet]

Merged! Thanks!