Updated link to official ClickHouse website

Merge pull request ClickHouse#53 from Enmk/fix_LowCardinality_Empty_v…

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Fix of LowCardinality bug: empty string converted to other value on INSERT

Merge pull request ClickHouse#50 from Enmk/DateTime64

Add DateTime64 data type.

Merge pull request ClickHouse#45 from Enmk/SimpleAggregateFunction

Implemented reading values of SimpleAggregateFunction

Bumped version to 1.2