2.7.0

• [DOC] Numerous docblock and README updates.
• [ADD] Add various Select::reset*() methods. Fixes #84, #95, #94, #91.
• [FIX] On SELECT, allow OFFSET even when LIMIT not specified. Fixes #88.
• [FIX] On SELECT, allow join*() before from*(). Joins-before-from are added
  to the first from. If no from is ever added, the joins will never be built
  into the statement. Fixes #69, #90.
• [BRK] Bumped the minimum version to PHP 5.3.9 (vs 5.3.0). Fixes #74. This is
  to address a language-level bug in PHP. Technically I think this is a BC
  break, but I hope it is understandable, given that PHP 5.3.x is end-of-life,
  and that Aura.SqlQuery itself simply will not operate on versions earlier
  than that. Updated README to reflect the version requirement.