TimeZone: fix base offset for Sri Jayawardenepura. Anchor tests for zone offsets to more current date

Namespace Inflector, Dependencies, OrderedOptions, and TimeZone under ActiveSupport [#238 state:resolved]

TimeZone#to_s shows offset as GMT instead of UTC, because GMT will be more familiar to end users (see time zone selects used by Windows OS, google.com and yahoo.com.) Reverts [8370]

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

Signed-off-by: NJoshua Peek <josh@joshpeek.com>

Time.zone.parse: compatibility with far future date with time zone offset in string. Eliminate creation of additional TimeWithZone instance to determine utc offset.

Fix Time.zone.parse from stripping time zone information and make Time aware attribute methods use Time.zone.parse instead of to_time

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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Time.zone= accepts TZInfo::Timezone instances and Olson identifiers; wraps result in TimeZone instance

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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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TZInfo caches Timezone instances in its own internal hash cache, so TimeZone::MAPPING doesn't need to cache them as well

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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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TimeZone#new renamed #local, so that new TimeWithZone instances can be created via Time.zone.local()

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Add Time Zone support to ActiveRecord, and config.time_zone property for specifying a default Time Zone.  Closes #10982 [Geoff Buesing, rick]

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TimeZone#to_s uses UTC rather than GMT; reapplying change that was undone in [8679]. References #1689

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Replace non-dst-aware TimeZone class with dst-aware class from tzinfo_timezone plugin. TimeZone#adjust and #unadjust are no longer available; tzinfo gem must now be present in order to perform time zone calculations, via #local_to_utc and #utc_to_local methods.

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Refactor number-to-HH:MM-string conversion logic from TimeZone#formatted_offset to reusable Numeric#to_utc_offset_s method

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Fixed that La Paz was included in -25200 and -14400 offsets when it should only be in -14400 (closes #9735) [bermi]

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