Section 1 Improvements#6

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nem035 wants to merge 8 commits intocareercup:masterfrom

Commits on Dec 29, 2016

ch1-q1: use semantically more appropriate for..of loop for iteration. This also handles non-BMP characters.
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ch1-q2: Added semantically more appropriate for..of loop and updated both functions to accept strings, not arrays, as per question specification
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ch1-q3: for..of loop
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ch1-q4: use const for variables that do not change.
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ch1-q6: added parameter descriptions/types
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ch1-q6: Converted the code to be more readable and aligned to the book. Added second solution that only creates the extra string if necessary.
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ch1-q8: Added the constant-space solution
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Merge branch 'master' of https://github.com/careercup/CtCI-6th-Edition-JavaScript-ES2015
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