Update simpleTableSorter.js

Now the plugin sorts each tbody section independently
Update simpleTableSorter.js

removed unused variables
Update simpleTableSorter.js

remove unused variable
Update simpleTableSorter.js

enhance sort capabilities
Update simpleTableSorter.js

refactored code
Update simpleTableSorter.js

sortColumn function optimized
Update simpleTableSorter.js

Added rows exclusion from tbody
Update README.md

documentation update
Update README.md

documentation rewrite
Update README.md
Update README.md
Update simpleTableSorter.min.js
Update simpleTableSorter.js

Remove dependency on rowspan and colspan attributes to exclude rows
Update simpleTableSorter.js
Update simpleTableSorter.js
Update simpleTableSorter.min.js
Update README.md
Update simpleTableSorter.js
merge conflict resolved