extractFaultyUrls.py: this new script exctracts all faulty URLs from a JMETER CSV result file. This script is enabled by default in jmeter-ec2.sh to toggle it use cfgExctractFaultyURLs flag

helpers.sh: added few new helper functions: findCSVColumnPostion, mean, stdev, median

resources/reportHeader.txt: added a new feature to display statistics.csv file on the report

jmeter-ec2.sh:
refactored the code a bit, added more comments etc
now script checks if project and custom properties files exist :)
added two new flags cfgCalculateSimpleStatsFromAResultFile & cfgExctractFaultyURLs.
Once enabled :
- cfgCalculateSimpleStatsFromAResultFile will calculate: mean, median, stdev, min, max for latency, response time, response size
- cfgExctractFaultyURLs - will scan every errors_csv.jtl and group all faulty URLs and save them in separate files
- increased the timeout for creating new AWS instance from 45 to 120 -> status_check_limit=120
jmeter-ec2.properties: updated AMI_ID and regions