V1.4 UI revamp and email attachment

[chanyikwai]

• UI revamp
• Email Attachment Fixes #114

[coveralls]

Pull Request Test Coverage Report for Build 215

• 27 of 46 (58.7%) changed or added relevant lines in 10 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.2%) to 74.213%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/main/java/seedu/address/email/EmailFunction.java	1	3	33.33%
src/main/java/seedu/address/email/message/ReadOnlyMessageDraft.java	0	2	0.0%
src/main/java/seedu/address/logic/parser/EmailCommandParser.java	5	8	62.5%
src/main/java/seedu/address/email/EmailSend.java	0	12	0.0%
<!--	Total:	27	46	58.7%	-->

Files with Coverage Reduction	New Missed Lines	%
src/main/java/seedu/address/email/EmailFunction.java	1	57.14%
<!--	Total:	1		-->

Totals
Change from base Build 212:	-0.2%
Covered Lines:	2452
Relevant Lines:	3304

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💛 - Coveralls