v0.4.0

• Add 'total' variable for formula and template (containing total hits returned by elasticsearch query)
• Add filtering support on number and date columns
• Add 'col0' syntax support in template
• Change alignment options order : 'right' before 'center'
• Change computed column example to 'col0 * col0'
• Fix CSS when visualization is edited
• Remove duplicated "data table" css
• Update expr-eval dependency to v1.2.1