v0.5.3

Quiqbox v0.5.3

Diff since v0.5.2

Merged pull requests:

• Fixed a bug of reduceGaussFuncs. (#117) (@frankwswang)
• Added direct RHF based MO optimization. (#118) (@frankwswang)
• 0.5-Debug Dev (#120) (@frankwswang)
• Bumped compat for FastGaussQuadrature to 0.5. (#121) (@frankwswang)
• 0.5-Doc Dev (#122) (@frankwswang)
• Updated the package version number. (#123) (@frankwswang)