Use the rescue variant for methods #29

...instead of a try block if the entire
method should be rescued
Do not document classes with "Represent $foo", it is redundant. #29
Making gemspec 1.8 ready #29
Converted Hash Syntax to 1.8 #29

With the help of the hash_syntax gem
Converted to 1.8 compatible delegator #29
Small adjustments for 1.8.7 compatibility #29
Added backports for keep_if #29
Forgot a require statement
Tiny adjustment to Rakefile for 1.8 #29

1.8.7 passes unit tests now
Added 1.8 Rubies to Travis #29

Allowing failures for now
Updated Readme and ArangoDB Version

* Current stable version as requirement
* Update the version downloaded on CI
* Contributors mentioned in README
* Some updates about 1.8 in the README
Added Parenthesis to all method calls #29