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repl: removing the buggy trimWhitespace function

Rodrigo Muino Tomonari requested to merge github/fork/thefourtheye/repl-regex-fix into master

As it is, the trimWhitespace function will not remove the white sapce characters at the end of the string, as the greedy capturing group .+ captures everything till end of the string, leaving \s* with nothing. This patch removes the function and uses a proper RegEx which will match all the whitespace characters at the beginning and ending of the string and replaces the matched whitespace characters with empty string.

This is a floating fix till https://github.com/nodejs/io.js/pull/2163 lands

cc @chrisdickinson

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