Merge pull request #47 from SpinGo/master

allow access to spheroid parameter
merge the two dWithin methods to one for postgis/geom support
refactor and enhance tests for array support
jump to v0.5.2.3
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revert last update
add date2 (jdk8 time) support
Merge remote-tracking branch 'origin/master'
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refactor to expose some util methods
correct 'PgDateJavaTypes' to 'PgDateJdbcTypes'
move 'PgDateJdbcTypeUtils' from `core` to `slick-pg`
correct 'PgArrayJavaTypes' to 'PgArrayJdbcTypes'
rename 'PgDateJdbcTypeUtils' to 'PgDateSupportUtils'
Added 'SimpleArrayListJdbcType' to pg array and refactored related codes
Added pg enum type support and tests
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jump to v0.5.3
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