TimeWithZone: date part getter methods (#year #mon #day etc) are defined on class; no longer relying on method_missing

Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

TimeWithZone#method_missing: send to utc to advance with dst correctness, otherwise send to time. Adding tests for time calculations methods

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Bundling abbreviated version of TZInfo gem 0.3.8: only the classes and zone definitions required to support Rails time zone features are included. If a recent version of the full TZInfo gem is installed, this will take precedence over the bundled version

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TimeWithZone time conversions don't need to be wrapped in TimeOrDateTime, because TZInfo does this internally

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Make TimeWithZone work with tzinfo 0.2.x: use TZInfo::Timezone#zone_identifier alias for #abbreviation, silence warnings on tests. Raise LoadError when TZInfo version is < 0.2 by sniffing for TZInfo::TimeOrDateTime constant. Move all tzinfo-dependent TimeZone tests into uses_tzinfo block

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Time, DateTime and TimeWithZone #in_time_zone defaults to Time.zone. Removing now unneeded #in_current_time_zone. ActiveRecord time zone aware attributes updated to use #in_time_zone

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TimeWithZone caches TZInfo::TimezonePeriod used for time conversion so that it can be reused, and enforces DST rules correctly when instance is created from a local time

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TimeWithZone #+ and #- behave consistently with numeric arguments regardless of whether wrapped time is a Time or DateTime; consistenty answers false to #acts_like?(:date)

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Adding TimeWithZone #to_yaml, #to_datetime, #eql? and method aliases for duck-typing compatibility with Time

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Adding Time and DateTime #compare_with_coercion, which layers behavior on #<=> so that any combination of Time, DateTime and ActiveSupport::TimeWithZone instances can be chronologically compared

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Introduce ActiveSupport::TimeWithZone, for wrapping Time instances with a TimeZone. Introduce instance methods to Time for creating TimeWithZone instances, and class methods for managing a global time zone

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