Fixes src-d#42 This PR implements the substring(str, start, length) function with the following rules: - negative start or length causes an error. - start bigger or equal to str length causes an error. - valid start with 0 length returns the empty string. - null string returns null. Since Go strings are UTF8, this function does not return a direct substring str[start:start+length], instead returns the substring of runes. That is, "á"[0:1] does not return a partial unicode glyph, but "á" itself. Signed-off-by: Miguel Molina <miguel@erizocosmi.co>

Implement SUBSTRING(string, start, length) function #42

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