Log Message:
Update ruby-highline to 1.7.2.

### 1.7.2 / 2015-04-19

#### Bug fixes
* Fix #138 (a regression of #131). PR #139.

### 1.7.1 / 2015-02-24

#### Enhancements
* Add travis CI configuration (Eli Young (@elyscape), #130)
* Add Rubinius to Build Matrix with Allowed Failure (Brandon Fish
(bjfish), #132)
* Make some adjustments on tests (Abinoam Marques Jr., #133, #134)
* Drop support for Ruby 1.8 (Abinoam Marques Jr., #134)

#### Bug fixes
* Fix IO.console.winsize returning reversed column and line values (Fission \ 
Xuiptz (@fissionxuiptz)), #131)

### 1.7.0 / 2015-02-18

#### Bug fixes
* Fix correct encoding of statements to output encoding (Dāvis (davispuh), #110)
* Fix character echoing when echo is false and multibyte character is typed \ 
(Abinoam Marques Jr., #117 #118)
* Fix backspace support on Cyrillic (Abinoam Marques Jr., #115 #118)
* Fix returning wrong encoding when echo is false (Abinoam Marques Jr., #116 #118)
* Fix Question #limit and #realine incompatibilities (Abinoam Marques Jr. #113 #120)
* Fix/improve string coercion on #say (Abinoam Marques Jr., #98 #122)
* Fix #terminal_size returning nil in some terminals (Abinoam Marques Jr., #85 #123)

#### Enhancements
* Improve #format_statement String coercion (Michael Bishop
(michaeljbishop), #104)
* Update homepage url on gemspec (Rubyforge->GitHub) (Edward Anderson
(nilbus), #107)
* Update COPYING file (Vít Ondruch (voxik), #109)
* Improve multi-byte encoding support (Abinoam Marques Jr., #115 #116 #117 #118)
* Make :grey -> :gray and :light -> :bright aliases (Abinoam Marques Jr., \ 
#114 #119)
* Return the default object (as it is) when no answer given (Abinoam Marques \ 
Jr., #112 #121)
* Added test for Yaml serialization of HighLine::String (Abinoam Marques Jr., \ 
#69 #124)
* Make improvements on Changelog and Rakefile (Abinoam Marques Jr., #126 #127 #128)