add requirements.txt file for all required packages for qbe
UI: add custom design field
design fields css changes
Merge branch 'dev' into issue_10_custom_design

Conflicts:
	qbe/templates/qbeapp/design.html
	qbeapp/static/qbeapp/css/style.css
updated normal design fields dropdowns alignments
fancy design div toggle using jquery-ui
add effect for sidebar table tree toggle
increase width for design fields
header style changes
show bar chart for report by choosing x and y axis
first check if x and y axis are provided then fetch the records
format x labels for better display
show fancy legend
show histogram for report values
add histogram link in design fields and show histogram on click
change name for bar chart button to show bar chart
show datatype in design field
add liteTxt style class
correct between and in clauses in where condition
+ OR condition issue
Merge branch 'where_clause_operators' into dev