merge fix for issues #289 (dynamic wait) and #295 (PHP 7 warning message) #6
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aisingapore#289 - enclose wait step with casper.then() in order to make dynamic wait delay in scope for access
aisingapore#295 - PHP 7 issues warning message which is not observed with PHP 5. this change removes the warning by avoiding an empty $repo_data[0]. ie increment repo_count only if there is already data in the array, otherwise discard header and start filling from $repo_data[0]. For the datatable (custom_csv_file portion), don't drop header as there is a dummy [iteration] header to let users reference current datatable iteration number.