Add source for AR5 WGI TS and SPM in HTML format
Add script to download HTML sources with curl
Add HTML sources for chapter authors of AR5 WGI
Add script to extract authors information from chapters

Script copied from a script with the same name in:
ipcc-fact-checking/ipcc-wg2.gov/2014-ipcc-ar5-wg2
Add author information for AR5 WGI extracted from HTML
Add chapter number for 'SPM' and 'TS'

The chapter title had been extracted
where the chapter number was expected.