fixing track tags fractions (#50)

* fixing exiftool-rb/exiftool_vendored.rb#37 issue where track tags were treated as fractions and were reduced to the lowest term in the output.

* update readme badges

Author: morozgrafix

README.md

@@ -4,8 +4,8 @@
 [![Gem Version](https://badge.fury.io/rb/exiftool.svg)](http://rubygems.org/gems/exiftool)
 [![Gem Downloads](https://img.shields.io/gem/dt/exiftool.svg)](http://rubygems.org/gems/exiftool)
 [![Gem Latest](https://img.shields.io/gem/dtv/exiftool.svg)](http://rubygems.org/gems/exiftool)
-[![Test Coverage](https://api.codeclimate.com/v1/badges/82cfb3b0d0d5e67499c7/test_coverage)](https://codeclimate.com/github/exiftool-rb/exiftool.rb/test_coverage)
-[![Maintainability](https://api.codeclimate.com/v1/badges/82cfb3b0d0d5e67499c7/maintainability)](https://codeclimate.com/github/exiftool-rb/exiftool.rb/maintainability)
+[![Code Coverage](https://qlty.sh/gh/exiftool-rb/projects/exiftool/coverage.svg)](https://qlty.sh/gh/exiftool-rb/projects/exiftool)
+[![Maintainability](https://qlty.sh/gh/exiftool-rb/projects/exiftool/maintainability.svg)](https://qlty.sh/gh/exiftool-rb/projects/exiftool)
 
 This gem is the simplest thing that could possibly work that
 reads the output of [exiftool](http://www.sno.phy.queensu.ca/~phil/exiftool)

lib/exiftool/field_parser.rb

@@ -81,7 +81,7 @@ def try_parse
     end
 
     def fraction?
-      raw_value.is_a?(String) && raw_value =~ FRACTION_RE
+      raw_value.is_a?(String) && raw_value =~ FRACTION_RE && sym_key != :track
     end
 
     def as_fraction

test/field_parser_test.rb

@@ -98,4 +98,9 @@
     p = Exiftool::FieldParser.new('GPSLongitude', -122.475666666667)
     _(p.value).must_be_close_to(-122.475666666667)
   end
+
+  it 'parses track tags without reducing a fraction to lowest terms' do
+    p = Exiftool::FieldParser.new('Track', '2/24')
+    _(p.value).must_equal('2/24')
+  end
 end