Update ExcelFile.groovy

Line number 190 and 199 - 
 the resulting collection is an Object range if we use [] and not () 
eg:
(1..10).each{println it} - works
[1..10] is a list of length 1 containing a single range
Reference:
http://stackoverflow.com/questions/12433413/calling-each-on-intrange-returns-the-range-not-each-integer

In addition, line 200 seems to be a duplicate of line 191.