Bump version 2.8.0.beta1
Accept values that respond to `to_f` in FloatField.

The checking for acceptable FloatField values was verifying that values
fell between -Infinity and Infinity. This worked for any number object,
including BigDecimal in MRI 1.9.2 <= & JRuby. In MRI 1.9.3 >=,
setting a BigDecimal raised a type error.

Since BigDecimal values pack the same way as Float values and their
aren't min/max values for double/float fields in Protocol Buffers, a
simple `respond_to?(:to_f)` call will suffice when checking for
acceptable values.

Closes #90.
Merge pull request #95 from localshred/90_float_field_type_checking

Accept values that respond to `to_f` in FloatField.
Add fallback support for activesupport 2
Merge pull request #98 from crystalcommerce/activesupport-fallback-2-7-stable

Add fallback support for activesupport 2
Bump version 2.7.11
Merge branch 'master' into 2-8-stable
Bump version 2.8.0.beta2
Merge branch '2-7-stable'
Merge branch 'master' into 2-8-stable
Bump version 2.8.0.beta3
Merge branch 'master' into 2-8-stable
Bump version 2.8.0.beta4
Merge branch 'master' into 2-8-stable
Bump version 2.8.0.beta5
Merge branch 'master' into 2-8-stable
Bump version 2.8.0.beta6
Merge branch 'master' into 2-8-stable
bump to beta8
Merge branch 'master' into 2-8-stable