So as promised (better late than never) here is the first revision of the schematics. I based the design very heavily off the work of [sprite_tm] with a few simple modifications of my own. Additionally I swapped out the charging IC with one capable of handling solar charging. It is pretty expensive.

One of my favorite little tricks that I used was in regards to the single ADC on the ESP8266. I needed to sense both battery voltage and the resistance of my input buttons. In order to get around the limitation imposed by one ADC I am using a analog switch IC. So when I need to sense battery voltage all I need to do is briefly toggle the switch.

I am sure that I hooked something up wrong; this is the most complex schematic I have ever made. If anyone would like to double check my work please let me know! The eagle .sch will be available below in addition the BOM on findchips.com